Case for an electronic device



FIG. 1 is a top front perspective view of a case for an electronic device showing the claimed design;

FIG. 2 is a bottom rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures show portions of the case for an electronic device that form no part of the claimed design. 

CLAIM The ornamental design for a case for an electronic device, as shown and described. 